522921 has 16 divisors (see below), whose sum is σ = 819584. Its totient is φ = 290304.

The previous prime is 522919. The next prime is 522943. The reversal of 522921 is 129225.

It is not a de Polignac number, because 522921 - 2¹ = 522919 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a Duffinian number.

522921 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (522961) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 441 + ... + 1113.

It is an arithmetic number, because the mean of its divisors is an integer number (51224).

2⁵²²⁹²¹ is an apocalyptic number.

It is an amenable number.

522921 is a deficient number, since it is larger than the sum of its proper divisors (296663).

522921 is a wasteful number, since it uses less digits than its factorization.

522921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 720.

The product of its digits is 360, while the sum is 21.

The square root of 522921 is about 723.1327678926. The cubic root of 522921 is about 80.5648051386.

The spelling of 522921 in words is "five hundred twenty-two thousand, nine hundred twenty-one".